Modeling Improved Behavior in Stand-Alone PV Systems with Battery-Ultracapacitor Hybrid Systems

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1 Modeling Improved Behavior in Stand-Alone PV Systems with Battery-Ultracapacitor Hybrid Systems Charith Tammineedi* Dept. of Energy & Mineral Engineering The Pennsylvania State University 221 Materials Research Building University Park, PA Jeffrey R. S. Brownson* Dept. of Energy & Mineral Engineering The Pennsylvania State University 224 Materials Research Building University Park, PA Kevin Leonard. SolRayo, Inc Felland Rd., Suite 107 Madison, WI 53718

2 Why Ultracapacitors Shelf and cycle life has been a problem with most types of batteries, but people have learned to tolerate this shortcoming due to the lack of an alternative. PV systems are not ideal for battery charging due to intermittency from weather and regional effects. The batteries are often deep discharged, which damages the battery and shortens its useful life. It is not possible to ensure an optimum charge/ discharge cycle. Ultracapacitors have high power density and low energy density which makes them better suited for load matching at higher frequencies.

3 Why Ultracapacitors

4 Why Ultracapacitors PV Intermittency due to the day/night cycle PV Intermittency due to cloud cover Aimee E. Curtright and Jay Apt Prog. Photovolt: Res. Appl. 2008; 16:

5 Why Ultracapacitors Fluctuations in 10 min to several hr range are relatively larger for PV. Rapid and deep fluctuations from 10s to several min many be due to low, scattered opaque clouds. This paper proposes an ensemble of energy storage devices for different regions of the plot. the ultracapacitor could compensate for frequent, short, and high power disturbances, while the battery could provide compensation for longerterm less frequent events Aimee E. Curtright and Jay Apt Prog. Photovolt: Res. Appl. 2008; 16:

6 Battery-Ultracapacitor Hybrid system i c i b i o + R c R b v o C c V b _ * Power and Life Extension of Battery Ultracapacitor Hybrids by R.A. Dougal, Shengyi Liu and Ralph E. White, IEEE Transactions on Components and Packaging Technologies, Vol. 25, No. 1, March 2002, pp

7 Modeling Methodology using TRNSYS SURFRAD Data Solar PV Model w/o Storage Stand-alone system Modeling Battery Battery-Ultracapacitor Hybrid VisSim 7.0 SolRayo's Ultracapacitors Preliminary Model Preliminary Model Model Validation Model Validation TRNSYS Compatible Fortran Model Full System Simulations Comparison

8 Solar PV model w/o Storage Power Generated by a PV system(437kw) for a Typical Year in Pittsburgh

9 Ultracapacitor Models Classical equivalent circuit model Adequately describes the capacitors performance in slow discharge applications (in the order of a few seconds). Equivalent series resistance (ESR) models the internal heating in the capacitor. The equivalent parallel resistance (EPR) models the current leakage effect

10 Ultracapacitor Models 3-Branch equivalent circuit model Improves upon the classical equivalent model. Each RC branch has a different time constant and hence models over a wider range of frequencies Transmission line model A Transmission line model accounts for frequencies up to 10 khz. The transmission line model has good accuracy over a wide range of frequencies.

11 Classical Equivalent Circuit-Mathematical Model

12 Simulation Results Charging Cycle Modeling Parameters: Nominal Capacitance: 1500F ESR = 0.47mΩ;EPR=3.0mA;Source Voltage = 2.7V

13 Conclusions and Future Work By employing both ultracapacitors and batteries in a hybrid system one can promote the advantages of both technologies In this work suitable models for Ultracapacitors are studied and will be experimentally validated The validated models will be incorporated into TRNSYS to perform the stand-alone system simulation Load matching capabilities of cases with the battery and batteryultracapacitor systems will be studied and compared.

14 Questions?!?

15 Traditional Capacitors Capacitor: Device That Physically Stores Electric Charge No chemical reactions used to store charge Negative Conductive Plate Positive Conductive Plate

16 How they Work

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